{"refrec":{"BRefID":437639,"RR":"<b>Paulhac Buisson, M.; Louvat, P.; Karancz, S.; Tian, R.; Raitzsch, M.; Bijma, J.; Rollion-Bard, C.</b> (2025). Determination of δ <sup>11</sup> B in Planktonic Foraminifera at the ng Level: Application to the Ontogenetic Variability in <i>Globigerina bulloides</i>. <i>Geochem. Geophys. Geosyst. 26(10)</i>: e2024GC011845. <a href=\"https://dx.doi.org/10.1029/2024gc011845\" target=\"_blank\">https://dx.doi.org/10.1029/2024gc011845</a>","BEntID":435470,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Geochem. Geophys. Geosyst. 26(10)</i>: e2024GC011845. <a href=\"https://dx.doi.org/10.1029/2024gc011845\" target=\"_blank\">https://dx.doi.org/10.1029/2024gc011845</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Paulhac Buisson, M.; Louvat, P.; Karancz, S.; Tian, R.; Raitzsch, M.; Bijma, J.; Rollion-Bard, C.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Paulhac Buisson, M. <i>et al.</i>","Englishabstract":"<span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">The boron isotope ratio (δ</span><sup>11</sup><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">B) of planktonic foraminifera is a robust proxy for determining oceanic pH and inferring atmospheric </span><i>p</i><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">CO</span><sub>2</sub><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\"> during the Cenozoic. However, measuring δ</span><sup>11</sup><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">B in these small and low [B] samples (3–16 ppm) is challenging, as&nbsp;a precision below 0.8‰ (2SD) is required, equivalent to ∼0.1 pH units, which reflects the scale of anthropogenic acidification or glacial/interglacial alternations. Moreover, uncertainties in paleoclimate reconstructions from biocarbonates are due to biomineralization processes, requiring species-specific calibrations of the pH-δ</span><sup>11</sup><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">B relationship to account for the so-called “vital effect.” While such calibrations exist for many species, the influence of foraminiferal size on δ</span><sup>11</sup><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">B remains poorly studied. We measured δ</span><sup>11</sup><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">B of </span><i>Globigerina bulloides</i><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\"> (80–190 tests, 3–5 ppm [B]), for three different size fractions (250–315, 315–400, and &gt;400&nbsp;μm), collected from the upper part of a core from the Chilean Margin. We validated a novel analytical method combining microdistillation for B purification and micro-direct injection (μ-dDIHEN) to the Multi-Collector Inductively Coupled Plasma Mass Spectrometer for accurate and precise (0.1–0.5‰, 2SD) δ</span><sup>11</sup><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">B analysis of the smallest samples (only 1–2&nbsp;ng&nbsp;B in solution). This approach injects only 10&nbsp;μL of solution, producing short injection peaks that minimize blank effects through transient signal processing, thereby improving paleo-pH reconstructions from small-sized foraminifera. Our results show no size-dependent variations in δ</span><sup>11</sup><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">B of symbiont-barren </span><i>G. bulloides</i><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">, confirming that its microenvironment is primarily influenced by respiration and calcification. This contrasts with symbiont-bearing species, where δ</span><sup>11</sup><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">B varies with symbiont density due to photosynthetic activity.</span>","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Determination of δ <sup>11</sup> B in Planktonic Foraminifera at the ng Level: Application to the Ontogenetic Variability in <i>Globigerina bulloides</i>","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-10 01:33:05.559215","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2025,"MonPub":null,"DateUpdate":"2026-02-13","DateCreate":"2026-02-13","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1,"DOI":"10.1029/2024gc011845"},"refs":null,"anarec":{"AnaID":437639,"PubliDate":2025,"Pagination":"e2024GC011845","XtraPublOfAnaID":null,"ISBN":null,"Volume":"26","Issue":"10","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":100768,"SerRR":"Geochemistry, Geophysics, Geosystems. 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